Adjustable window screen



Nov.6, 1956 s. K. MAHLOUFF ADJUSTABLE WINDOW SCREEN 5 Sheets-Sheet l Filed Jan. 7, 1952 Nov. 6, 1956 s. K. MAHLOUFF ADJUSTABLE WINDOW SCREEN 5 Sheets-Sheet 2 Filed Jan. 7, 1952 ww. H mw, ww, QHHUQ wumwhmmmwmmmmlmmwn m\ www, ww. Ow HW Nov. 6, 1956 s. K. MAHLOUFF ADJUSTABLE WINDOW SCREEN 5 sheets-sheet Filed Jan. 7, 1952 am u 1956 s. K. MAHLOUFF 'ADJUSTABLE wmnow SCREEN v Nov. 6,

5 Sheets-Sheet 5 Filed Jan. 7. 1952 signor-pf twenty-tive percent to Frank C. Tenzer, Ste. .AgathedesMonts-Quehec,Canada Application January 17, 1952, Serial No. 265,263

15 Clams. ,.(Cl. 160-21) This finventen relates Ato a window Pscreen construction 'and more particularly to improvements'inwmdow screens of the Vlaterally 'and 'vertically adjustable type.

A particular object of the invention "is to Vprovide durable top and bottom screen frames and .housings `of a novel 'construction between which Ascreening is attached for=vertical adjustment, said screening, frames and housings y'being laterally adjustable to 't vwindows of different AWidths.

Another -object is to Vprovide a-novel interlocking arrangement between the 4upper frames 'and the ylower hous- `ings respectively'for telescopic adjustment `0f the frames and of the housings relative to one another.

A furthertobject is toprovide a locking means'atoppoysite ends of the'frames and housings for securing the frames to the housings against separation Whenthe'assemvblyr'is in its closed up condition. This'is'particu'larly de sirable when thescreens are being handled during transportation-or when not in use, as it affordsv protection to Vthe screening as vwell as the frames and housings, which otherwise might be destroyed or damaged during hantiling.

A still further Objectis to Vp rovide .an adjustable screen, the component parts of which may 'be made of relatively light, durable and Vinexpensive materials suchas plastic, .and/or aluminum, die-cast material, Vrolled sheet material andthe like.

Other objects and characteristic features of Ythis Ainvention will become more Ireadily apparent from the 'followingedetailed description taken in connection xivithfthe accompanying drawings, in which:

Fig, 1 is a perspective view of a screenembdyng this invention, shown vin its closed position.

Fig. 2 is an elevational view of 'a Screen, Showingit secured to a window frame and sash.

Fig. V3 is a plan view of the lower housing 4frames 4taken along the section lines 3 3 Aof Fig. 2.

Fig. 4 is a View of the housings shown inFig. 3 which have been separated and arranged inperspective 'for viewing the top walls and adjacent inner side walls in detail.

Fig. 5 is a sectional View of one of thehousings taken 'along the section lines 5--5of Fig. 4.

Fig. 6 is a vertical sectional view taken along the lines 6-6 of Fig. .2.

Pig. 7 is a vertical sectional view, enlarged, taken `alongthe lines 7-7 of Fig. 2.

Fig. 8 is an end view of thescreenconstruction.

Figure 9 is a longitudinal sectional View taken along the lines 9 9 of AFigure 14.

' Fig. 10 isa view in'perspective of one end ofa housing and the abutting inner surface of its removableend wall.

Fig. ll is a'bottom plan view of the upper framestaken along the section lines .11*11`of Fig. ,2.

Fig. 12 is an enlarged top plan View partly'broken and Ypartly in section ,0f the frames shown in Fig..1fl which have 'been removed from the sash frame ...for the .sake .of vclarity.

Fig. 13 is a detail perspective view partly in section,

nted States Patent ice i2 oa portion of-one ofthe-upper frames shown in-Fig. P12.

Fig. 14 yis -a sectional Aview Vtaken along the section llines 14-14of1Fig- Y12.

fFig. i15 Ais a broken detail 1viewfof an opposite 'end of eaeh-upperlframe showing them in relation to thecorrespending end VYof each lower `housing frame.

Fig. 16 is a detail View of oneend of an upper frame, being the Vadjacent Lvend of -the companion to one of the yframes shown in Fig. l5.

Fig. 1157 is lan exploded View 'in perspective of a modiiied housing assembly, certain parts .being broken away and certain parts Aremoved forclariiication Fig. v18 is a perspective View Yof one end of a modified upper frame assembly which, :with Vthe component parts of the assembly Vshown in Fig. 17, constitute a -comple't'e screen assembly.

Fig. 119 is 4afperspective view of one endof K4the assembly shown in Fig. 17 showing icertain v:parts in assembled-relaftionzand showing :the upper frame assembly of Fig. v18 in section :to v:indicate Vtheir :relative positions in the loverall assembly.

Fig. 20 iisza .verticalsectional view through `one of the housings :of fFig. 17 as it would appear in `assembled relation.

Fig. 21 is 'an VCexplodedview in perspective of one vofva yfurther modified lhousing assembly, certain parts VVbeing Abroken taway for sake of clarity.

fFig. .122 is `a perspective View of `one end of a lfurther modification .of the lupper frame assembly.

Fig. 23 is a fragmentary View of the 'inner bottom corner of an finboard .cap shown in Fig..21.

lFig. 24-is va--sectional vieu/:taken along the lines .Z4-24 of Fig. 21.

Fig 25 is a 'fragmentary view fof a vdetail of the `inboard and outboard caps shoWn -in Fig. 21.

Fig. .26. is `a fragmentary view in rperspective, illustrating a :modication'of the assembly shown in Fig. 21.

Fig. 27 is a fragmentary view of the inner bottom cerner of; an inboard cap shown in Fig. 26.

"Fig. 28 :is a sectional lview taken-along the Vlines 28-28 of Fig. 26.

Fig. 29 `is va `view similar .to Fig. 28 Ybut showing a modified interlocking arrangement.

Fig. v30 -is a fragmentary view similar to Fig. 26 but illustrating Aa vfurther modilication'in the assembly.

Fig. 31 is a sectional view illustrating a further Amodi- -ed form of an `upper frame assembly.

Fig. 32 is a fragmentary view of the inner bottom .corner of an inboard cap shown in Fig. 30.

Fig. 33 is a sectional -viewtaken along the lines 33-33 of Fig. 30.

Fig. 34 Vis .a perspective view of one end of a still further Vmodified housing assembly, certain `parts being broken `away for clarity.

lPig. 35 is a sectional view showing a still further moditied form of upper frame assembly.

Referring more particularly to the drawings, 5 generally indicates va two-way adjustable screen including a pair of 'upper frames 6 and 7 of plastic or other light, durable material, slidable relative to one another for lateral adjustment of the screen and a pair of lower housings VV8 and 9 also ofplastic or other light, durable material, laterally slidable relative to one another in cooperation with the upper frames. A pair of flexible screening strips 10 and 11 are disposed in face-to-face relation, strip 10 being secured at its upper and lower edges between frame 6 and housing 8 and strip 11 being secured at its upper and lower edges between frame 7 `and housing 9. Each screening Ystrip 10 and.11.is slidable relative to one another wi'th-the respective frame :andhousing to which it 'is secured lfor lateralV adjustment of the screen.

AReferring more particularly to Figs. 12, l3,r1 4land1.6,

upper frames 6 and 7 are of a Vhollow structure and are arranged side by side with the side openings of the hollow interiors 12 and 13 in face-to-face relation. Frames 6 Vand-'Tare yunited along their adjacentsides byanfinterlocking dovetailing arrangement (see Figs. 12 and 1.4) above the hollow interiors 12 and 13. This interlocking arrangement comprises'dove-tailgrooves 14 and 1 5 ex- Vtending the full length of frames 6 and 7, respectively,

and dove-tail'projections 16 and 17 carried by frames 6 and 7 respectively. Dove-tail projections 16 and 17 are arranged at opposite ends of frames 6 and 7 with the projection 16 dove-tail fitted for sliding movement in groove 15 of frame7 and projection 17 dove-tail fitted jfor: sliding movement in groove 1 4 of frame 6. Each dove-tail projection extends from one end of its respective Vframerforfa predetermined'distance toward the midsection of the frame so that, when the frames are slid relativeto one another in opposite directions for lateral extension, the inner ends of the dove-tail projections will Vserve as abutments to prevent further extension of the Vframes beyond a predetermined point.

As geen in Figs. 11, i2, 13 and 14, geh frame is Ahollow from the end remote from the dove-tail exten- .6 and 7 respectively are mounted in end walls 22 Vand 23 remote from the dove-tail extensions and in the inner end of the solid portionsV where the dove-tail extensions are 1ocated. Screening strip 10 is secured at its upper .end to rod 20 of frame 6 while strip 11 is secured to rod 21 of frame 7. The bottom walls 24 and 25 of frames 6 and7 are recessed along their inner edges, as indicated at 26 and 27, throughout the length of the hollow sections to provide clearance between the overlapping portions of screening strips and 11. This clearance should be only suicient to avoid frictional contact of strips 10 andV 11 with each other during lateral extension of the screen.

Channel shaped spring clamps'28 and 29 are dove-tail fitted in corresponding, transverse slots 30 and 31 in the upper side of frames 6 and 7 in'wedging engagement. These clamps are adapted to be clipped to the under side of thelower sash 32 of a Window frame.

The lower housings 8 and 9, as seen in Figs. 3,*4 and 5, are of a hollow construction throughout their length. These housings are arranged side-by-side and are united along their adjacent sides by an interlocking dove-tailing arrangement (see Fig. 7) similar to that Vof the frames 6 and 7. This interlocking arrangement comprises dovetail grooves 33 and 34 extending the full length of the inner side walls 35 and 36 of housings 8 and 9 adjacent 'the base thereof, and dove-tail projections 37 and 38 carried by housings 8 and 9 respectively. Dove-tailrprojections 37 and 33 are arranged at opposite ends of housings S and 9 with the projection 37 Vdove-tail fitted for sliding movement in groove 34 of housing 9 and projection 38 dove-tail fitted for slidingrmovernent in groove 33.Y Each dove-tail projection extends from the end of itsrespective housing for'a predetermined distance comparablerto the corresponding projection of frames 6 and 7.V When housings 8 and 9 are moved relative'to one another in Vopposite directions in cooperation with frames 6 and 7 for lateral extension of the screen, the inner ends of dove-tail projections 37 and 38 will serve as abutments limiting the extension of the housings in the same manner as the projections of frames 6 and 7.

Housings 8 and 9 are provided at opposite ends with chambers 39 and'40 (see Figs. 3, 5 and 7). These cham- -bers are located at the ends of the housings which carry the dove-tail projections and are closed at'their outer ends. Spring rollers 41 (see Fig. 7), including a spring Y' Y v2,769,490

41a helically coiled about a shaft 42 and secured (at one end thereto,ran end abutment 43 to which the other end of spring 41a is secured and a spring housing 44 fitted thereover in engagement with abutment 43, are inserted in the open inner ends of chambers 39 and 40 and are secured under tension for reeling and unreeling by the spring roller trunnions 45 'which are fitted in key slots 46 provided in the side walls of the chambers.

Shafts 42 project from the free endrof rollers 41 to rotate therewith andy extend throughout the remainder of the length of housings 8 and 9 Vand are secured` at their outer ends in the end Walls 47 and'48 respectively of the housings. That portion of each housing beyond chambers 39 and 40 is hollowed to provide an inner wall surface which is oval in cross-section, as indicated at 49 and 50, the depth being greater than the breadth.

As seen in Figs. 4, 6 and 7, side openings 51 and 52 are provided in the upper half of adjacent inner side walls 35 and 36 of the housings 8 and 9. The screening strips 10 and 11 extend through the side openings 51 and 52 and are secured at their lower ends to shafts 42 to be Wound therearound through the action of spring rollers'41.V The top walls 53 and 54 of housings 3 and 9 are recessed along their inner edges, as indicated at 55 and 56 to provide clearance between the overlapping portions'of screening strips 10 and 11. This clearance Vshould be suf`cient to permit lateral adjustment of the screen without.v frictional contact of the overlapping screening strips 10 and 11 but care should be taken to avoid gapping `between the Yscreening strips.

Y End walls.47 and 48 of housings 8 and 9 are removable (see Fig. 10) for inserting the spring rollers 40 and shafts 42 withthe screening attached thereto. End vWall 48 is recessed in its inner surface, as indicatedrat 58, to conform withV the Vcross-section of the inner wall surface 50. The Wall `48 is provided with top and side fianges 59 and 604 which overlap top and side Walls 54 and 61 of housing9, when fitted thereon. A central opening 62 in thev recessed portion of end wall 48 serves as abearing surface for the outer end of shaft 42. Studs 63 and 64 on-the inner'surface of'wall 48 are received in complementary openings 65 and 66 .of housing 9 for centering the end Wallk with respect to the end of housing 9. Parallel upper and lower locking pins 67 and 68 extend through openings 69 and 70 in the top and'side flanges 59 and`60 respectively and engage aligned recesses 71 'and 72 lin said-housing, pin 68 also underlying stud 64 in a recess 73 provided therefor in the under side of stud 64 Y n Y The end wall 48 Visrprovided with a lateral extension w74, having a central opening v75 for the reception of a complementary'projection 76 (Fig. 5) on the adjacent end of housing 8. The outer marginal portion of extension 74 is bent rearwardly, outwardlyv and then forwardly to form a spring clip 77 which is fastened about-the sashV guidevrail 78 (Fig.'3)of the Window frame adjacent the -sill. A.dove-tail.groove 79 on the top of end wall 48 overlying the recessed portion 58 of the end wall receives the adjacent end 23 of frame 7 which has complementary dove-tail fiangesV 80 (Fig. 16) on the side walls adjacent the bottom thereof. An abutment 81 on top of extension 74 which is undercut on the inner surface, serves as an end stop lto frame 6. As seen in Fig. 15 frame 6 has aV notch S2 on its end into which abutment 81 is recessed when the screen is in its closed up condition.

Endwall v47 is of substantially the same l construction as end wall 48V. As seen in Figs. 3 and 4, it is provided with a recessed inner surface V(not shown) corresponding Vto recess 5S of `end wall 48 and conforming with the contour 49. of the inner Wall surface of hous Y ingS. Topandside anges 85 and 86 overlap the upper and kouter, side walls 53 and 87 of housing 8 whenthe :fitted in Complementary 2openings in 4the and af the housing. r1`he end wall is locked in place bypins .tuoi hown) 1,1 1a Similar manner to that Set .forth in Sanastpn with ,end wall 48 A lateral extension@ has aetltralspsningfor the Igan-Pilon f a .Complementary Projection '91 .0.11 the adjacent and gf hf-)using 9 1.11- stead sf having a Spring Clip at the over @ad :of the ilat- ,erabextension .of Vthe end wall, as shown connection with end Wall 4 8, the .end vWall 47 Vhas spring clip l92 integrally `connected to side iange ,3.6 Ytofextend rearwardly, outwardly and then forwardly therefrom to be spring clipped about windowV frame rail 95. With .this arrangement it will be seen that .spring clips 77 and 92 .areon s ame side .of the screen. A .done-tail `groove 93, similar to .groove 79, Vis provided for the reception of the .end 22 Vxof frame-6 which `has complementary dovetail langesl As seen in Fig. 15, abutment 94, similar to .abutment 81, serves -as V a stop member for the adjacent end of frame 7 which is notched at 9.6, in a similar manner to lthe motel-18,2 on the opposite end olfirarne 6.

4For transportation and storage purposes the screen is telescoped in the manner shown in Eig. ,1, with the window clamps ZSand 29 removed. In this `position the end projection 91 is iitted in central opening 9.0 of the extension 89 of end wa'll 47 and the .housings 8 and 9 are butted against the inner surface .of said extension. The end 22 of frame 6 is dove-tail fitted in groove 93 in locking engagement `to prevent vertical separation of the frame and housing. Also the adjacent end of frame 7 .is butted against abutment 94. Similarly, end projection '7 6 is Vfitted in central opening 75 o f the extension 7 4:Y Frame 7 is dove-tail tted at its end23 in the gtoove 79provided therefor onend wall 4 3 and the adjacent end of vframe 6 is butted against the undercut abutment S1. Y

To set the screen up in its operative condition, the housings 8 and 9 are extended slightly to remove projections 76 and 91 from .engagement with end wall extensions 74 and 89 respectively and also to-separate the ends22 and'23 of frames .6 and 7 from their locking engagement inthe grooves 79 and 93. The screen is then set upon a window sill (see Fig. `2) and the screens are Vlaterally extended until guide rail clips 77 .and-'92 are spring clipped about ,the guide rails inthe side frame of the W'indow. Frames 6 and 7 areV then placed in abutment with the under surface of the bottom frame of a Window'sash and clamps 2 3 and 29 .are spring fastened tosaid bottom Vframe. The screen is now iri its operative position and will expand or contract in vthevert'ical direction to the limit of the screening length'with raising and lowering ofthe window sash.` Y

in Figst -17 to 20, I Vhave illustrated a-modied form of screen assembly which includes upper Yframe members 100 and'101, housings A102 and 103 Aformed 'by extrusion of plastic or metals and moulded or die-cast end-0r cap members 104 and 1052 As shown in Fig. 18, upper frame members 100 and 101 are .provided with a central longitudinally extending channel 106 and a restricted groove 107 in the upper surface communicating with channel 106. U-shaped holding clips 108, for gripping the lower edge of abottom sash, are provided with a pair of retaining studs 109 titted for sliding .movement in channels Y106 with the shank portion of the studs projecting through vgrooves 101 A YStud 119., Screw threaded. thbush an. opening inonearmpf .clip 108, engages one side ofthe sashframe' to Yretain the clip in position. Frame member 10.0 hasn T-shaped tongue projection 100:1 along one side wrhich is. .Slidbly vtttd in a @reglamentan Side Channel in frame member 1.13.1 for longitudinal Sliding mettaient 0f oneframe member relatire to the athen The under Sid@ of frame members 100 and 10.1 are slotted, as indicated at 111, adjacent their meeting-edges, to :receive the-upper ends .of the .screens therein. The Vscreens are retained in :slots V111 :either by compressing. tongues V'1 /12 thered against, er .in the Case .Of a Plastic material the Ysi ia11 .may be sealesin the-slot bran adhesive or bytheanpiication o f heat to the plastic around the slot,

As shown in Fig- 17, the screen 'housings 10.2319@ 19.3 are hollow throughout their length and present ton-battom and .one side wall 1115, 11.6 and 1.17 .respectively- Top wall has its free side .edge 11.8, Slightly in rear `0f the Cortesia@.ldins Sidia `edge of the bottom Wall .1.1.16 no Vthat when the housings 102 and 103 are disposed in side- .by-side relation, there will be suficient room for ,the screens to pass freely therebetween. The bottom Y116 of each housing are provided -with an upwardly Yprojectingmember 119 adjacent the -freesidezedge which has -a longitudinally extending bayonet slot y120 opening into the outer side face. The inner wall-of member 1119 is tapered as indicated at 121 to permit lfree lwindingiof the screen about a mandrel within the housing. When the Vhousings are disposed in side-byside relation theside vopenings of each bayonet slot "120 will be positioned opposite one another to receive locking members, hereinafterldescribed,.forretaining the housings in -fae-to-face engagement for longitudinal sliding movement of -the .One housing relative -to the other.

As will be seen particularly in Fig. 20. each screen 123 is wound about a mandrel 12,4 having its inner end con- :nected at 125 to one end of a coil spring`126 contained in afspring Ahousing-5127. Mandrel 124 is fixed to rotate with spring housing 127 -in yany suitable manner. The

yscreens are arranged so that the spring housing 127 is at one end .of screen-housing 102 and at the opposite end of 'screen housing 103.

As shown in Figs. 17 md 20, vone end of each screen :housing -102 and 105 containing the spring housing 1'27 is provided Vwith an end or cap member 104, -whic h, for the lsalte of brevity, I have termed an inboard cap. Cap 104 comprises a substantially rectangular-outer wall l129 provided on its inner surface with a central -trunnion 13,0 over which the outer Yend of spring housing 127 is titted to rotate thereabout. A bottom and two top projections 131, 132 and 133, respectively, on the innersurface of outer wall 129 are shaped on their inner surfaces to conform-With thefouter surface of spring housing 127 so as .to :overlap the outer surface of vspring housing 127 when'the latter is tted over trunnion 13.0. The outer side --surfaces of projections 131, V132 and 133 are shaped to provide shoulders for inner surface'portions of screen housings y102 or 03- so that one end of :each ofsaid housings will overlap the-shoulders of said projections when the inboard cap is tted to the end ofv the'screen housing. -It will be noted that the shoulders -of these projections are inwardly offset from the marginal edges of the outer wall 129 so that the outer'surfacesof the screen' housing will be flush with the marginal edges of the inborard cap. The inboard cap lmay be locked to theend ofscreen housings 102 and 103 respectively by any suitable means, such as pins 134 extending through the walls of the screen housing andinto-suitable holes in -any of the projections 131, 132, or 133.

The free end'of spring 126 fis tted in aslot, asindicated at 135, in a spring-winding pin 136 which ,projects through inboard cap 104 and trunnion 130. Theouter 'end of pin V13 6 Vhas .a slotted, enlarged head 137 which is receivedin a deepened recess 138 in the outergsurface -of thecap. .A cotter pin 139 adjacent the spring retain ing .end of pin .136..is also receivable in arecess 140 in trunnion 130. When the spring 126 is attached to pin 13.6 it normally pushes the pin so that .the Vcotterpin 139 recedes into recess 140 and the Lhead 137 is ush with the outer surface of cap. 104. To increase the tension on spring 126 a suitable tool is fitted in the slotted head 137 and the pin 136 is moved inwardly until the Cotter pin 139 is free of recess :140. When suitable tension yhas been lapplied by turning pin 136,- the pin is pushed eoutwardly bythe action of spring 126 until 'the cotter l-pir'l -139 is :received in :recess 140.-.

Each finboard cap. 104 is provided-with Ya bayonetlike projection 141 at one side which is slidably tted in the bayonet slot 120 of the opposing screen housing. In this manner-,the inbo'ardf'cap V104 at'onerend of screen housing 102 supports housing 102 for sliding movement relative to housing V103 by engagement of its bay- Y onet projection 141 in bayonet slot 120 of screen housing 103. Similarly the inboard cap at the opposite end of screen housing 103 supports housing 103 for sliding movement relative to housing 102 by engagement of its bayonet projection 141 in bayonet slot 120 of screen housing 102.

The end of each housing 102 and 103 remote from the spring housing is provided with an outboard cap member 105. Each outboard cap is of a width equal to the combined widths of the two housings 102 and 103, and of a height equal to the combined heights of a screen housing 102 or 103 and a corresponding upper frame member 100 or 101 when superimposed on the housing. Outboard cap 105 is vertically divided into two sections 142 and 143. The section 142 which is fitted to the end of housing 102 and 103 remoteffrom the spring housing end is inwardly offset adjacent its upper edge from the inner surface to provide a recess 144 to receive the adjacent end of the corresponding upper frame member 100 or 101 which is seated on a shoulder 145. It will be seen that the length of the upper frame members Y is greater .than the length of thescreen housings by an amount equal to the depth of recess 144. The inner surface of outboard cap 105 is also provided with upper projections 146 and 147 and a lower projection 148. Projections 146, 147'and 148 are inwardly offset from the marginal edge portions ofthe inner surfacerof the outboard cap and are contoured about their outer side edges to provide receiving shoulders for the end of the screen housing so that when the screen housing is fitted thereabout and butted against the inner surface of the outboard cap the outer marginal vedges of the screen housing will be ush with the marginal edges of section 142 of the outboard cap which lies below the recess 144. The central portion of the inner surface of section (142 below recess 144 is circularly recessed, as indicated at 149, for a depth substantially equal to the depth of recess 144 to receive the end of the rolled screen therein.

A central opening 150 in the outer wall of outboard cap 105 receives the reduced end 151 of mandrel 124 for rotation therein. The inner face of section 142 is also recessed, to provide a vertical slot 152 between shoulder member. VA Vbayonet-like projection 153 on the inner face of outboard cap section 142 is received in the end of the bayonet slot 120 ofthe screen housing which is fitted to section 142. Pins 154 through corresponding holes in the walls of the screen housing and the shoulder projections 146, 147 and 148, secure the housing to the outboard cap section 142.

The outboard cap section 143 serves as an abutment for the adjacent end of the opposing screen housing and its corresponding upper frame member. A stud 155 on the inner surface of section 143 projects into the end of channel 106 of the corresponding upper frame member when the latter is superimposed on Vits corresponding screen housing to prevent outward movement of the upper frame member from the housing when the screen assembly is telescoped to closed position. A second stud 156 on the inner surface of cap .section 143 is received in a complementary recess 157 in the outer face of the adjacent inboard cap 104 when the latter is butted against said outboar cap section 143 in the closed position of the screen assembly. it will be noted that the bayonet projection 141 of inboard cap 104 vis inwardly offset from the outer face of the inboardv cap V104 to position said bayonet projection 141 inwardly of the bayonet projection153 on the inner face of outboar cap Y.

section 142 when the screen assembly is in the closed position.

The bottom and lower side edges of outboar cap are recessed, as indicated at 158, to receive a U-shaped spring member 159, the latter being secured thereto Vby screws 15911 in the bottom of the cap. The side arms of spring 159 are normally biased away from the side edges of the outboard cap and are compressed between the sash parting strip and inside stop strip of the sash frame to secure the screen housings at the base of the window frame against any upward force applied. It will be noted that the outer ends of spring member 159 tend toY be projected outwardly by the biasing action of the spring member to engage the opposing surfaces of the parting and stop strips of a window frame to prevent upward movement of the screen housings in the window frame.

The side edge of recess 158 and spring 159 are tapered at 159]; to facilitate tting of the cap and spring in the window frame.

In Figs. 21 to 24 I have illustrated a further modication of my screen assembly, including upper frame members 160 and 161, screen housings 162, and 163 formed of rolled sheet metal and modified inboard and outboard cap members 164 and 165.

Upper frame members 160 and 161 are formed from a sheet metal blank rolled to provide top and bottom walls 166 and 167 and inner and outer side walls 168 and 169 in which the tops 166'are provided with `longitudinal dove-tail grooves 170.respectively.V The inner side walls 168 of frames 160 and 161 are rolled to form interlocking grooves and tongues 171 and 171a respectively for sliding movement of the one frame relative to the'other. The free ends of each sheet are overlapped adjacent lthe juncture of the bottom and inner side walls 167 and 168 with an extension of each inner wall 168 being bent inwardly and then outwardly upon itself to form an inner side recess 172 Vadjacent the bottom to receive the upper marginal edge of the screen. The screen is held in said recess 172 by pressing the side walls of the recess together.

When the upper frame members 160 and 161 are interlocked U-shaped clips 173 similar to holding clips 108 are slidably arranged thereon by means of dove-tail pro- Y jections 174 on the under sideof Vthe clips which are slidable in the dove-tail grooves in the top walls 166 respectively of said upper frame members.

The screen housings 162 and 163 are each formed from a sheet metal blank rolled to provide a top, an outside and a bottom wall. The inner edge of the top wall is ent to provide an inturned lip 175. The bottom wall of each housing has an upward extension 176 at itsrinner,

end which is provided with a longitudinally extending dove-tail groove 177.Y The inturned lips 175 are inclined to provide a smooth sliding surface for the screens passing therebetween. These Vinturned portions 175 are in'-l wardly offset from the upturned extensions 176 to provide sufcient clearance for the screens between the housings when the latter are disposed in face-to-face relation. Y

The inboard caps 164 differ from caps 104 in cer-vV tain details. A continuous projection 180 extends inwardly from the rectangular outer wallsr17 9 about'which the inner surfaces of the housing walls'are fitted. Studs 181 are provided on the outer surfacesA of projection 180 which are received in suitable openings in lthe housing Y walls. These studshave aY cam surface 182 (seeFig. 25) to permit the housing to be slidably fitted over the projection 180 until the Astuds are alignedlwith the openings in the housing walls. One side face of projection l180 is suitably recessed at 183 for slidable fitting of the housing upward extension 176 with its dove-tail shaped member 177. Beyond recess 183 is an interlocking dove-tail projection 184 which is received in the dove-tail groove 177 of the opposing housing to permit sliding movement ofV the one housing relative to the other. f

Projection 180 is recessed, as indicated at 185 toreceive a springphousingv 186'for rotationtherein. The Y lapping portions of said screening strips being slightly spaced from each other to prevent frictional contact between their adjacent'surfaces during lateral adjustment of said screen construction.

4. A screen construction as set forth in clairn 1, including locking means carried by the outer end of each housing member and Yengageable with the adjacent end of the correspondingV upper frame member to prevent vertical separation therefrom when the screen construction is in its collapsed position.

5. A screen construction as set forth in claim 1, in-

cluding an end wall removably mounted on the outer end of one of said housings and a corresponding end wall removably mounted on the opposite end of the other housing, means securing said end wall to said housing' and locking means carried by said end wall and adapted to engage the adjacent end of the corresponding frame to prevent vertical separation of said frame and housing when the screen is in its closed position.

6. A screen construction as set forth in claim 5, said -locking means including dove-tail tongues carried by the said frame membersand dove-tail grooves in the upper edge of said end wall interlockable with the dovetail tongues of the frame members. Y

7. A screen construction as set Aforth in claim 5, said end wall being provided with a laterally extending clamping member clampable to a sash guide rail of a window frame. v

8. A screen construction as set forth in claim 5, in which each of said end walls is provided with extension members adapted to be butted againstthe adjacent ends yof the opposing upper frame and housing members.

9. A Vscreen construction asset forth in claim 5, said `housing being provided with stud receiving recesses in the end face yand with pin receivingrecesses in opposite sides adjacent said end face, said end wall being provided with side openings aligned with the housing pin receiving recesses and said means for securing Vthe end wall to the housing comprising positioning studs on the inner surface of said endV wall fitted in the corresponding stud receivingl recesses Vin the housing and a plurality of pin members inserted `through said side'opem'ngs provided in the end wall to engage in the pin receiving recesses of the housing in locking engagement, at least one of said studs Vbeing recessed to receive a portion of a pin member in locking engagement therewith.

, 10. A screen construction -as set forthV in claim 1, in which each of said frame members and veach of said housing members is united to its companion member by interlocking connectors comprising -a male connector carried by one of said members and a cooperating female Vportion carried by the opposing corresponding member,

said Vconnector and portion being interlocked for sliding movement of each member relative to the corresponding member to provide endwise extension of said members.

11. A screen construction as set forth in claim 1, in

which said housing members are provided with side openings in their Vadjacent side walls through which the ends of the screens are inserted for securing to said housings, veach of said housings having the side edge of one wall adjacent said side wall'inwardly offset with respect to the adjacent surfaces of the overlapping portions of said f screening strips being slightly spaced from each otherV to prevent frictional contact between Ytheir adjacent surfaces during lateral adjustment of said screen construction.'

12. A screen construction as set forth in claim 1, including an outer end wall removably mounted on the outer end of one of said housing members and a corresponding outer end wall removably mounted on the opposite outer end of the companion housing member, means securing each of said end walls to its complementary housing member, said end walls being provided with an upwardly directed extension againstwhich the adjacent end of the corresponding upper framemember is butted and a laterally directed extension against which the adjacent ends of the companion housing member and its corresponding upper frame member are butted when the screen construction is in its collapsed position.'

13. A screen construction as set forth in claim 12, in which said outer end walls are provided at opposite sides with divergent compression members compressible to engage the inner surfaces of opposing guide rails for a sash frame to retain said end Walls against sliding move-V ment relative to the frame.V

14. A screen construction as set forth in claim 12,.

of the -other housing, means securing each of said innerV end walls to its complementary housing, each of said inner end walls being butted against'said side extension of the outer end wall of the opposing housing when the screen construction is collapsed, and locking means carried by each of said extensions to engage the adjacent inner end wall for limiting the latter to endwise movement.

15. A screen construction as set forth in claim 12, including means for separately interlocking said companion `housing member -and its corresponding upper frame member with said laterallydir'ected extension when they are in face-to-face relation, said means comprising a lateral projection from thek face of the one, vsaidvprojection being received in .the opposing face ofthe 'other to prevent extension Iwhen the screen construction is collapsed.

References YCited in the iile of` this patent UNITEDV STATES PATENTS 64,101 Hartshorn Apr-23, 1867, 483,382 Jones Sept. 27, 1892 998,102 Ludwig July 18, 1911 1,172,800 Johnson Feb. 22, 1916 1,287,135 Swanson Dec. 10, 1918 1,729,133V Shonnard Sept. 24, 1929 Y 1,803,042 VThurman Apr. 28, 1931 2,240,834 Dollsrtedt May 6,' 1941 2,486,568 Lukaszevig Nov. 1, 1949 2,498,094 Plaum Feb. 21, 1950 

